Since updating FRITZ!OS, "Power" LED flashes

Since updating FRITZ!OS, the FRITZ!Box can no longer establish a DSL connection. The FRITZ!Box's "Power" LED flashes continuously since the update and the following error message is displayed in the event log of the FRITZ!Box:

"DSL not responding (no DSL synchronization)"

Note:The configuration procedure and notes on functions given in this guide refer to the latest FRITZ!OS for your FRITZ!Box.

Simply proceed as described below. After each measure, check whether the issue persists.

1 Restarting the FRITZ!Box

Unplug the FRITZ!Box for 5 seconds.

Note:The FRITZ!Box settings remain intact. The restart will take about 2 minutes. During this time, you cannot access the FRITZ!Box.

2 Checking the event log of the FRITZ!Box

Check whether the error message "DSL not responding" is constantly displayed, or whether the FRITZ!Box establishes an intermittent DSL connection and then only displays the message when the connection drops.

If the message "DSL not responding" is constantly displayed, proceed with the following section.

Click on the "Line Settings" tab. If the tab is not displayed, enable the Advanced View first.

Click the "Reset Setting" link.

Now the interference resistance is automatically set to "Maximum Performance".

4 Using the previous DSL version

The DSL version of the FRITZ!Box undergoes constant development with each FRITZ!OS to ensure that it can establish optimal DSL connections under all circumstances. In individual cases (for example on DSL lines with outdated DSLAMs) the FRITZ!Box may only be able to establish a DSL connection with certain DSL versions. Therefore, enable previous DSL version: